Nitrile-Propargyl Electrolyte Additive for High-Temp Battery Stability
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Solution Overview
Problem
Lithium secondary batteries face performance degradation due to metal ion elution and structural destruction at high temperatures, leading to reduced capacity and cycle lifespan, as the positive electrode's structure is compromised, and metal ions are electrodeposited on the negative electrode.
Innovation Solution
A non-aqueous electrolyte additive comprising compounds with nitrile and propargyl groups is introduced, which adsorbs metal ions and forms a stable ionic conductive film on the electrodes, preventing electrodeposition and side reactions, thereby enhancing capacity and cycle lifespan characteristics at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium secondary batteries operate at high temperatures, then energy density and power output are improved, but metal ion elution and structural destruction of the positive electrode are accelerated, leading to performance degradation
Solution Approach 1:
The patent introduces a specific electrolyte additive compound (Formula 1) as an intermediary substance that mediates between the positive electrode and electrolyte. This compound adsorbs metal ions eluting from the positive electrode through its nitrile group, preventing their deposition on the negative electrode, while also forming a protective film on the positive electrode surface to prevent structural destruction, thus maintaining reliability during high-temperature operation
Solution Approach 2:
The patent converts the harmful effect of metal ion elution at high temperatures into a beneficial effect by using the electrolyte additive to selectively adsorb these metal ions. The nitrile group in the additive compound has high affinity for metal ions, transforming the harmful metal ion elution into a controlled adsorption process that prevents electrode deterioration and maintains battery performance
2Quantity of substance
If the positive electrode potential is increased to improve energy density, then capacity is improved, but metal ion elution and electrodeposition on the negative electrode are accelerated
Solution Approach 1:
The electrolyte additive acts as an intermediary that intercepts metal ions before they can deposit on the negative electrode. The compound's nitrile group specifically binds to metal ions in the electrolyte, creating a complex that prevents harmful electrodeposition, thereby allowing higher positive electrode potentials to be used without increasing metal ion-related damage
3Ease of manufacture
If conventional electrolytes are used to maintain simple design, then manufacturing cost is reduced, but capacity retention and cycle lifespan at high temperature are degraded
Solution Approach 1:
The patent modifies the chemical parameters of the electrolyte by introducing a specific additive compound (Formula 1) with particular molecular structure characteristics (nitrile group and propargyl group). This parameter change in the electrolyte composition enables the formation of a stable protective film on the positive electrode and effective metal ion adsorption, significantly improving capacity retention and cycle lifespan at high temperatures while maintaining compatibility with conventional battery manufacturing processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The non-aqueous electrolyte additive effectively suppresses metal ion elution and forms a stable film, improving residual capacity, recovery capacity, and cycle capacity retention when stored at high temperatures, maintaining battery performance and preventing battery swelling.
Implementation Method 1
A non-aqueous electrolyte additive comprising compounds with nitrile and propargyl groups is introduced, which adsorbs metal ions and forms a stable ionic conductive film on the electrodes
Data Source
AI summary
The present invention relates to a non-aqueous electrolyte additive, and a non-aqueous electrolyte for a lithium secondary battery including the same and a lithium secondary battery, and particularly, to a non-aqueous electrolyte additive having a nitrile group and a propargyl group, and a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery, which include the non-aqueous electrolyte additive so that capacity and cycle lifespan characteristics at high temperature can be improved.